ZeroTol® HC Broad Spectrum Algaecide, Bactericide & Fungicide — 1 gal — OMRI Listed®

Lighter-Concentration ZeroTol for Hydroponic & Aquaponic Systems

Full-strength facility disinfectants are formulated for hard surfaces, not for water systems where people, fish, or beneficial organisms may have regular contact. ZeroTol HC scales the same hydrogen peroxide and peroxyacetic acid chemistry as BioSafe Systems' other ZeroTol products down to a lighter concentration, Hydrogen Peroxide 5.34% and Peroxyacetic Acid 1.36%, suited to hydroponic, aquaponic, and general greenhouse use where a gentler application rate is appropriate.

At a 0.75 to 1 oz per gallon rate, this 1 gallon container leaves no toxic residue and carries a 0-hour REI and zero-day PHI, so it fits routine use around people, pets, and wildlife without extended waiting periods.

Key Features & Benefits

• Lighter concentration for water systems — formulated for hydroponic, aquaponic, and landscape use rather than industrial-strength surface disinfection.
• Broad-spectrum contact control — targets powdery mildew, Botrytis, Pythium, Fusarium, and algae.
• No toxic residues — safe around people, pets, and wildlife after application.
• 0-hour REI, zero-day PHI — no extended re-entry wait and no pre-harvest interval.
• OMRI Listed — approved for certified organic production.

Who Should Use This

Hydroponic, aquaponic, and greenhouse growers who need routine algae and disease control in water-contact systems, without the handling precautions a full-strength disinfectant requires, are the direct fit for ZeroTol HC.

About BioSafe Systems

BioSafe Systems, founded in 1998 and headquartered in Connecticut, scales its peroxyacetic acid chemistry across concentrations, from full-strength surface disinfectants to lighter formulas like ZeroTol HC built for water-system use.

Frequently Asked Questions

How is ZeroTol HC different from standard ZeroTol 2.0?

ZeroTol HC uses a lighter concentration of the same hydrogen peroxide and peroxyacetic acid chemistry, formulated for hydroponic, aquaponic, and general greenhouse use rather than industrial-strength surface disinfection. Check both labels to confirm which concentration matches your specific application.

What is the application rate for ZeroTol HC?

Apply at 0.75 to 1 oz per gallon of water, adjusting within that range based on the target pathogen and system being treated. Always follow the current product label for specific rates.

Is this product safe around fish in an aquaponic system?

ZeroTol HC is labeled for aquaponic use at its designated rate, and leaves no toxic residue after application. Always follow the specific aquaponic application guidance on the product label before use around live fish.

What pathogens does ZeroTol HC control?

It controls powdery mildew, Botrytis, Pythium, Fusarium, and algae, along with additional bacterial and fungal pathogens listed on the label. See the full label for the complete list.